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A time-dependent atomistic reconstruction of severe irradiation damage and associated property changes in nuclear graphite

TitleA time-dependent atomistic reconstruction of severe irradiation damage and associated property changes in nuclear graphite
Publication TypeJournal Article
Year of Publication2017
AuthorsFarbos B, Freeman H, Hardcastle T, Da Costa J-P, Brydson R, Scott AJ, Weisbecker P, Christian G, Vignoles GL, Leyssale J-M
JournalCarbon
Volume120
Pagination111 - 120
Date PublishedAug-2017
ISSN00086223
KeywordsTRANSMISSION ELECTRON-MICROSCOPY; MOLECULAR-DYNAMICS SIMULATIONS; HIGHLY ANISOTROPIC PYROCARBONS; THERMAL-CONDUCTIVITY; NEUTRON-IRRADIATION; CARBON; GRAPHENE; DEFECTS; ENERGY; NANOSTRUCTURE
Abstract

Wheat grains can be considered as a natural cemented granular material. They are milled under high forces to produce food products such as flour. The major part of the grain is the so-called starchy endosperm. It contains stiff starch granules, which show a multi-modal size distribution, and a softer protein matrix that surrounds the granules. Experimental milling studies and numerical simulations are going hand in hand to better understand the fragmentation behavior of this biological material and to improve milling performance. We present a numerical study of the effect of granule size distribution on the strength of such a cemented granular material. Samples of bi-modal starch granule size distribution were created and submitted to uniaxial tension, using a peridynamics method. We show that, when compared to the effects of starch-protein interface adhesion and voids, the granule size distribution has a limited effect on the samples’ yield stress.

URLhttps://linkinghub.elsevier.com/retrieve/pii/S0008622317304542
DOI10.1016/j.carbon.2017.05.009
Short TitleCarbon
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